Select top in postgresql

postgres
postgresql
programming
sql
query
find
3 more ...
[Edit]
EN

PostgreSQL - select first N rows

2 contributors
7 contributions
0 discussions
0 points
Created by:
Select top in postgresql
leila
255

In this article, we would like to show you how to find and selectthe first row from a table in PostgreSQL.

Quick solution:

SELECT "column1", "column2", "columnN" FROM "table_name" LIMIT N;

Practical example

To show how to select the first N rowsfrom a table, we will use the following table:

Select top in postgresql
PostgreSQL - example data used to select the first N rows from the table

Note:

At the end of this article you can find database preparation SQL queries.

Example 1 - select all columns

In this example, we will select all the information (columns)about the first 3users from the users table.

Query:

SELECT * FROM "users" LIMIT 3;

Output:

Select top in postgresql
PostgreSQL - select first 3 rows from a table - result

Example 2 - select specified columns

In this example, we will findthe first 3 users id,name and emailcolumn information.

Query:

SELECT "id", "name", "email" FROM "users" LIMIT 3;

Output:

Select top in postgresql
PostgreSQL - select first 3 rows from a table - result

Example 3 - first row in some order

In this example, we will select the first row in some order.

SELECT * FROM "users" ORDER BY "name" LIMIT 3;

Output:

Select top in postgresql
PostgreSQL - select first row from a table ordered by name (alphabetical) - result

Database preparation

create_tables.sqlfile:

CREATE TABLE "users" ( "id" SERIAL PRIMARY KEY, "name" VARCHAR(100) NOT NULL, "email" VARCHAR(100) NOT NULL, "country" VARCHAR(15) NOT NULL );

insert_data.sqlfile:

INSERT INTO "users" ("name", "email", "country") VALUES ('Tom', '', 'Poland'), ('Chris', '', 'Spain'), ('Jack', '', 'Spain'), ('Kim', '', 'Vietnam'), ('Marco', '', 'Italy'), ('Kate', '', 'Spain'), ('Nam', '', 'Vietnam');